P.P. PROPERTIES OF GROUP RINGS
P.P. PROPERTIES OF GROUP RINGS
A ring is called left p.p. if the left annihilator of each element of R is generated by an idempotent. We prove that for a ring R and a group G, if the group ring RG is left p.p. then so is RH for every subgroup H of G; if in addition G is finite then |G|−1 ∈ R. Counterexamples are given to answer the question whether the group ring RG is left p.p. if R is left p.p. and G is a finite group with |G|−1 ∈ R. Let G be a group acting on R as automorphisms. Some sufficient conditions are given for the fixed ring RG to be left p.p.
Keywords:
p.p. ring Baer ring, group ring,
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- ISSN: 1306-6048
- Yayın Aralığı: Yılda 2 Sayı
- Başlangıç: 2007
- Yayıncı: Abdullah HARMANCI